Demoivre, Abraham - He was a French mathmatician who fled to England in 1685. He is famed for devising the Central Limits Theorems, which justify the use of normal approximations. He also created the first known table that shows the present value of a lifelong annuity.

Disjunctive Normal Form - Refers to an order of logical equations where there is a disjunction of conjunctions and no conjunction contains a disjunction.
For example the DNF of ((A OR B) AND C) would be ((A AND C) OR (B AND C)).

DIX Ethernet - Refers to the original ethernet developed by Digital, Intel and Xerox.

dll or DLL - Is a Dynamic Link Library or Dynamic Loaded Libraries

DM - Refers to Delta Modulation.

DMA - Is Direct Memory Access. A DMA channel permits specified types of data transfers between RAM and a device to bypass a microprocessor.

Download or Downloads - Is the transfer of data, information or files from a remote site to a local site. Often viewed in terms of a local user or programmer receiving files, software, data, information, or other digitized signals hosted at a remote server.

Dual-In-line Package Switch - These are often used to set IRQ and DMAs for modems, video cards, sound cards and other slot add ins. They often function like flip-flops connected to a multiplexor, but may be connected to multiple multiplexors and/or other devices. DIPs are common on EISA or VESA cards and are rare on PCI cards with plug and play compatibility.

Dual Scan Display - Is a type of LCD that is partitioned into two parts. Each part is simultaneously scanned. This improves contrast and reduces shadowing effects.

DVD - Refers to Digital Video Disk. It is a format for viewing and storing movies or data and can refer to the disk itself.